About Callback

Callback is a VC funded early-stage startup based in Tokyo, founded in the Spring of 2021 by Harvard and Stanford alumni.

Callback is a new way to socialize in real life. It lets you express who you are, connect with others, verify membership, and distribute special tokens (coming soon), all with just a tap. Concretely, the Callback mobile app currently allows users to create web profiles with an image and info and purchase stickers linking to their profiles for themselves or others. It supports Web3 by having profile NFT verification and has a feature for venues to verify NFT ownership for entrants. In the future, Callback will be more Web3 focused, with features such as distributing tokens from stickers and creating a Proof-of-Meetup protocol. Callback’s mission is to be the primary, secure bridge between the physical and Web3 worlds.

Work when you want, where you want

We don’t care when in the day you do your work, and you can work fully remotely.

English speaking, internationally friendly team

Our team communicates in English. We prefer you to be living in Japan, but are open to international applicants and will assist with a Japanese work visa sponsorship and travel (if desired).

About the position

We’re hiring a full-time full-stack react native developer to join our software engineering team. As an engineer, you’ll be working with our team on continuing to develop our mobile app’s front-end and back-end. You should also be able to effectively communicate and work well within the team regarding app development.

In addition, we want you to bring your creative mind and entrepreneurial spirit. You will have the opportunity to support other aspects of the company, such as business development, marketing, or product design. As an early employee, you’ll be integral to shaping the company’s future direction.


Nice to haves

These aren’t required, but be sure to mention them in your application if you have them.


¥7 – ¥13 million annually.

This position is closed and is no longer accepting applications.

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